AU/AH: A story based off of the movie 'Friends with Benefits' with my own changes. Klaus and Caroline get hot and heavy but only as friends? Could that be possible?

Kol and Bonnie have been best friends since high-school but as close as they have been, nothing ever developed further than a close friendship until he left for war and realized his true feelings. But it might just be too late now that he returns and she is engaged to someone else. Kennett fic with the Original family strongly on focus. Klaroline and Sinn. AU/AH